A small coaxial laser module for the Gb/s transmission-speed range

A coaxial laser module based on a small CD laser header is described. The module has a diameter of 5.6 mm and a length of 14 mm. By modifying the standard CD laser header the electrical performance could be up-graded to a 5 GHz bandwidth. The coupling optics is designed for low feedback and includes an optical isolator. Coupling efficiencies up to 80% have been achieved. >